Hypothetical Odd Couples

Continuing Quartet (10-yr-old girls) this morning. 

Cello [in the middle of working out a fingering pattern]: Oh!  Hey.  Wouldn't it be, like, so weird, if there was, like, a couple, and he played violin and she played cello?
Viola: Oh, yeah...
Me: Er - why is that?
Cello: Because, well, a violin is, like, a small instrument... and a cello is so much bigger... and so it would be, just, so weird for the guy to be playing the small one like [high pitched imitation of violin playing, similar to Psycho] and she's all [deep gruff cello imitation].
Violin 1: Even weirder - if the girl plays double bass!
Girls: Whoa!!  That would be ridiculous!!